1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b108204d54ba91026a986d40fbc045bc72679980e492055effd8f8cd716f22. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c265ae1-79f5-4857-a521-e8b57032c95a.json and https://artists.proofprofile.net/proofs/artist/8c265ae1-79f5-4857-a521-e8b57032c95a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0183176964c19b31aad6695b829f4567f4252aa130cf6ea1fee41f67b0547b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USK340800958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b6e80684e389a52855a6f2a221c2e8445a1e8988f56ad638530fcb61658d5a. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USK340800964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788c66d02a28780b61a89228df4891ed4fbe68ee97617f17f3c306f9c5ffc413. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USK340800965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d22a798d9f85b350ac4124f820d4e3b3aae78f2981f1afc4176e8be939dc7c4. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USK340800967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd60dc04e103b0e6be87ae3900ee732dd50ce8e787a4b7034e287e9cbc64d1d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789eede19cc638b8d40ba29ca96c88be19f0ad2b649e02ce0f913aed196a8b1a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd60dc04e103b0e6be87ae3900ee732dd50ce8e787a4b7034e287e9cbc64d1d. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e3134e9cdd4613384229d21cf5d99de9c745bb2b692b70db82350465d071ee. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8f122ae8e317efa222ab273c69afa0dffba981cca9e1c996441164486943bc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd691645e82c5adb25c357df4642aab772ef59de6a3a9d7692d700a66690e0ff3. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240389c87b54b635d9355e784e996686769a1dd8f5b8f3949db84a7af7d1d4ed. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b93c56db3959350cf57eb0f5d060cbabee5fef6d45fce4e512f14980d34ce29. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ad05ea3ee8a594c53e4c019ab03d0bf27a64e36e4764f3064fbaafb4426816. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8d2c6d2eedfe0a31a368d33cb39034f82625104279f7ef86a3f34383796e16. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC1885396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff56b53480d45414e700cefc446b5d9b2b4ab3168b2203c361d6c00eb8c9bff. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC2073861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff56b53480d45414e700cefc446b5d9b2b4ab3168b2203c361d6c00eb8c9bff. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC2073861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9bb7dec7d0418794ef14ad9535c84466b1c879cff0c68c6c4e8d3b8196b3d4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC2087447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa14387866e6d2c603ab4ec15a36e671824d6533c0e7cc0fcec9e41a99d0706. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6DC2097635.